A couple months ago I foolishly purchased a roof rack for my station wagon, thinking I would use it to carry 4x8 plywood and sheetrock from the home supply center back to the farm. Then I realized how dangerous this would be--at highway speeds (which I would need to travel), the wind could rip them right off if I didn't strap them in correctly or if a connection failed. I don't want to kill the guy behind me because I was trying to save money on delivery fees.
That being said, plenty of people do carry sheet goods on roof racks, and for short trips where you can do less than 30 MPH, perhaps it's safe. The biggest hazard might be to your back, trying to muscle the sheets atop your car. So this fellow here came up with a clever way to load the sheets by himself:
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Do any of you use roof racks to transport sheet goods? If so, over what distances, and at what speeds? The tow eyes on my car are the lousy kind that are mounted off-center and hidden behind panels on the bumper, and I'm not confident that I could use them to create a robust connection front and rear.